{{{{{{pat}}}}}
Until I got to your second post about your daughter being an ex-heroin addict, I would have answered slightly differently. However, my father was an alcoholic and, now that I'm an adult and can look back more detached, I strongly believe he was depressed or bi-polar and was self-medicating by drinking. He was very angry most of the time and treated my mother HORRIBLY when she was doing sooo much for him...and me. So, I can understand that type of behavior.
However, when I was in college my mother said, "If you have children, don't expect me to babysit. I've already had my child (I'm an only)." My mother and I have ALWAYS had a great relationship, more like friends. For her to say this, I knew she meant business!! The reason I'm mentioning this is we're talking here about a mother/daughter with no mental health issues. (Mine became apparent in my early 20's) Considering your health, I would have said earlier that your daughter SHOULD be helping YOU anyway she can. Since she has her own issues, concentrating on her own health (does she see a pdoc or T?) would be very beneficial.
Anyway, the main point is to not let her guilt-trip you, even if she's not doing it intentionally.
And I'm in the "liking animals better than (some) people" group too!
I'm thinking of ya, Pat.